ML082620090

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Final Status Survey Summary Report, July 14, 2008, Electrical Penetration Room 209, 20' Auxiliary Building, Upper Walls and Ceiling, Survey Unit F8131382
ML082620090
Person / Time
Site: Rancho Seco
Issue date: 07/14/2008
From: Stein M
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
MPC&D 08-064
Download: ML082620090 (41)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report July 14, 2008 Electrical Penetration Room 209, 20' Auxiliary Building, Upper Walls and Ceiling Survey Unit F8131382 Prepared By: Date: ____

iSS Engineer Reviewed By:7* A 4 . Q_ Date (CAJL(f, Lead FSS Engineer Approved By: - 7 Date: 7 -

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8131382, Electrical Penetration Room 209, 20' Auxiliary Building, Upper Walls and Ceiling Survey Unit

Description:

Operating History: The reinforced concrete structure contained the RadWaste processing and supporting systems. The building contained six main elevations. Residual radioactive material was known to be present on all levels of the interior of the building.

Operating records and the HSA document several events with the potential for a release of radioactivity inside this structure. One report documented contamination of the auxiliary building roof. The roof was later replaced.

Site Characterization: Direct measurements were made of each of the interior elevation surfaces as well as the exterior surfaces of the structure. These measurements confirmed the presence of plant-derived radionuclides. Direct measurements on the -47' elevation showed a mean gross activity level of 320,071 dpm/1 00 cm 2 and a maximum value of 5,720,000 dpm/100 cm 2 . Direct measurements on the -29' elevation showed a mean gross activity level of 544,756 dpm/100 cm 2 and a maximum value of 11,370,000 dpm/l 00 cm 2 . Direct measurements on the -20' elevation showed a mean gross activity level of 247,831 dpmr/100 cm 2 and a maximum value of 10,080,000 dpm/l00 cm 2. Direct measurements on the grade elevation showed a mean gross activity level of 373,758 dpm/100 cm 2 and a maximum value of 5,800,000 dpm/100 cm 2. Direct measurements on the +20' elevation showed a mean gross activity level of 85,408 dpm/100 cm 2 and a maximum value of 1,900,000 dpm/100 cm 2 . Direct measurements on the +40' elevation showed a mean gross activity level of 3,288 dpm/100 cm2 and a maximum value of 24,781 dpm/1oo cm 2 . Direct measurements on the building exterior, including the mezzanine roof, showed a mean gross activity level of 1,897 dpm/100 cm 2 and a maximum value of 2,990 dpm/100 cm 2. (The roof had been replaced prior to the classification survey.) Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior of the auxiliary building was determined to be a Class 1, 2 area and the exterior was a Class 2,3. The Electrical Penetration Room 209 upper walls and ceiling were determined to be a Class 1.

HSA Events: HSA Report pg. 63.

Survey Unit Design Information:

The Survey Unit Design Parameters are presented in Table 1 below. The survey unit and measurement locations are depicted on the maps in Attachment 1. Direct measurement locations were determined using a random-start, fixed grid pattern and 312 m2 were scanned for 100% coverage. Samples of removable contamination were collected at each direct measurement location. The instrumentation used for the survey along with the MDC values are listed in Tables 2-1 and 2-2 in Attachment 2.

Page 2 of 10 FSS Summary Report F8131382

Table 1. Survey Unit Design Parameters Survey Design Value. Comment Parameter Survey Area: F813 Electrical Penetration Room 209, 20' Auxiliary Building, Upper Walls and Ceiling Survey Unit: 1382 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 312 Evaluator: Michael Stein DCGL (dpm/100 cm 2): 43000 Gross Activity DCGL Area Factor: 3.6 Class 1 Design DCGLemc 154800 Class I (dpm/100 cm 2):

LBGR (dpm/100 cm 2). 21500 Default = 50% DCGL Design Sigma (dpm/100 cm 2): 5461 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 6.9 Class 1 Scan Area (m2): 312 Scan Coverage (%): 100% Class 1 1.645 1.645 Sign P: 0.99865 Calculated Relative Shift: 3.9 Relative Shift Used: 3 Uses 3.0 if Relative Shift is

>3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Design Min Samples N: 45 Class 1 Grid Spacing L: L 2.6 .1. Class 1 Page 3 of 10 FSS Summary Report F8131382

Survey Results:

A total of 63 direct measurements were made in F8131382. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. None of the beta scan measurements indicated areas of elevated activity. Beta scan activity ranged from 1,563 to 45,196 dpm/100 cm 2, based on a surveyor efficiency of 0.5 and no background subtracted. None of the gamma scan measurements detected activity due to plant operations. Scan measurement locations for both beta and gamma emissions are identified in Attachment 1 of this report. Samples for removable surface activity were all less than 10% of the DCGL as shown in Table 3.

Removable surface activity samples were counted for alpha activity and none was detected at the MDC shown in Table 2-1 of Attachment 2.

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm)

F8131382-CO001BD .2225 F8131382-CO002BD .2168 F8131382-CO003BD 1961 F8131382-CO004BD 2075 F8131382-CO005BD 1956 F8131382-CO006BD 1852 F8131382-CO007BD 1753 F8131382-CO008BD 2028 F8131382-CO009BD 1899 F8131382-CO01OBD 1888 F8131382-CO01IBD 1826 F8131382-CO012BD 1530 F8131382-CO013BD 1478 F8131382-CO014BD 1525 F8131382-CO015BD 1587 F8131382-CO016BD 1406 F8131382-CO017BD 1478 F8131382-CO018BD 1323 F8131382-CO019BD 1473 F8131382-CO02OBD 1395 F8131382-CO021BD 1432 F8131382-CO022BD 1665 F8131382-CO023BD 1442 F8131382-CO024BD 1452 F8131382-CO025BD 1790 F8131382-CO026BD 1592 F8131382-CO027BD 1551 F8131382-CO028BD 1136 F8131382-CO029BD 1359 F8131382-CO03OBD 1426 F8131382-CO031BD 1385 F8131382-CO032BD 1452 F8131382-CO033BD 1504 F8131382-CO034BD 1484 F8131382-CO035BD 1354 Page 4 of 10 FSS Summary Report F8131382

F8131382-CO036BD 1421 F8131382-CO037BD 1665 F8131382-CO038BD 1437 F8131382-CO039BD 1551 F8131382-CO04OBD 1629 F8131382-C0041 BD 1416 F8131382-CO042BD 1546 F8131382-CO043BD 1509 F8131382-CO044BD 1541 F8131382-CO045BD 1613 F8131382-CO046BD 2448 F8I31382-CO047BD 2495 F8131382-CO048BD 4710 F8131382-CO049BD 2122 F8131382-CO05OBD 2303 F8131382-C0051BD 1442 F8131382-CO052BD 1442 F8131382-CO053BD 1292 F8131382-CO054BD 1323 F8131382-CO055BD 1406 F8131382-CO056BD 1229 F8131382-CO057BD 1369 F8131382-CO058BD 1338 F8131382-CO059BD 1712 F8131382-CO06OBD 1509 F8131382-C0061BD 1618 F8131382-CO062BD 1556 F8131382-CO063BD 1447 Mean: 1666 Median: 1525 Standard Deviation: 489 Rancqe: 1136 -4710 Page 5 of 10 FSS Summary Report F8131382

Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2 )

F8131382C0001SM -3.53 F8131382C0002SM -3.53 F8131382C0003SM -3.53 F8131382C0004SM -3.53 F8131382C0005SM -2.24 F8131382C0006SM -0.95 F8131382C0007SM -0.95 F8131382C0008SM -3.53 F8131382C0009SM 0.34 F8131382C0010SM -2.24 F8131382C0011SM -3.53 F8131382C0012SM -2.24 F8131382C0013SM -2.24 F8131382C0014SM -0.95 F8131382C0015SM 2.93 F8131382C0016SM -0.95 F8131382C0017SM -0.95 F8131382C0018SM -0.95 F8131382C0019SM 0.34 F8131382C0020SM 1.64 F8131382C0021SM -3.53 F8131382C0022SM -6.11 F8131382C0023SM -3.53 F8131382C0024SM 0.34 F8131382C0025SM -2.24 F8131382C0026SM -4.82 F8131382C0027SM 1.64 F8131382C0028SM 4.22 F8131382C0029SM -2.24 F8131382C0030SM -4.82 F8131382C0031SM -2.24 F8131382C0032SM 5.51 F8131382C0033SM -2.24 F8131382C0034SM -0.95 F8131382C0035SM -2.24 F8131382C0036SM -0.95 F8131382C0037SM -0.95 F8131382C0038SM -2.24 F8131382C0039SM -4.82 F8131382C0040SM -3.53 F8131382C0041SM -2.24 F8131382C0042SM 0.34 F8131382C0043SM -2.24 F8131382C0044SM -3.53 F8131382C0045SM -0.95 F8131382C0046SM 19.72 F8131382C0047SM 11.97 F8131382C0048SM 36.5 F8131382C0049SM -0.95 F8131382C0050SM -0.95 Page 6 of 10 FSS Summary Report F8131382

F8131382C0051SM -0.95 F8131382C0052SM -4.82 F8131382C0053SM 0.34 F8131382C0054SM -0.95 F8131382C0055SM -2.24 F8131382C0056SM -4.82 F8131382C0057SM -3.53 F8131382CO058SM 4.22 F8131382C0059SM -0.95 F8131382C0060SM -2.24 F8131382C0061 SM -4.82 F8131382C0062SM -3.53 F8131382C0063SM -4.82 Mean: -0.6 Median: -2.24 Standard Deviation: 6.16 Range: -6.11 to 36.5 Page 7 of 10 FSS Summary Report F8131382

Survey Unit Data Assessment:

The survey design required 45 direct measurements for the Sign Test. In actuality, 63 direct measurements were obtained. The critical value and the results of the Sign Test are presented in Table 4. The sample mean and median values were less than the DCGL. The sample standard deviation was less than the design standard deviation so no additional samples were required.

Page 8 of 10 FSS Summary Report F8131382

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2 ): N/A Ambient Background Used (dpm/100 cm 2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 63 Median (dpm/100 cm 2): 1525 2

Mean (dpm/100 cm ): 1666 Direct Measurement Standard Deviation 489 (dpm/100 cm 2):

Total Standard Deviation (dpmlO00 cm2): 489 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): 4710 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 63 S+ Value: 63 Critical Value: 38 Sufficient Samples Collected: Yes Maximum Value < DCGL: Yes Median Value < DCGL: Yes Mean Value < DCGL: Yes Maximum Value < DCGLemc: Yes Class 1 Total Standard Deviation <= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis? Yes Does the Survey Unit Pass All Criteria? Yes Page 9 of 1.0 FSS Summary Report F8131382

Survey Unit Investigations and Results:

No investigations were required for either direct or scan measurements and no investigation results are reported.

ALARA Statement:

As stated in Chapter 4 of the LTP, as long as the residual activity within the survey unit is less than the DCGL (i.e. the survey unit average activity is less than the DCGL and the EMC criterion has been met), the ALARA criterion has been met.

Changes in Initial Survey Unit Assumptions:

The survey unit was designed as a Class 1 structure survey and the sample results are consistent with that classification. The variability of the survey results was less than the characterization data used for survey design. No potential areas of elevated activity were detected.

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 1 survey based on Table 5-4 of the LTP. The required number of direct measurements was made and the scan coverage met the requirement of Table 5-6 of the LTP.No direct measurements exceeded the DCGL of 43000 dpm/100 cm2 and none of the removable surface activity measurements exceeded 10% of the DCGL. No investigations were required.

The direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.

It is concluded that survey unit F8131382 meets the release criteria of 10CFR20.1402.

Page 10 of 10 FSS Summary Report F8131382

Attachment 1 Maps July 14, 2008 Survey Unit F8131382

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North Sample Line Chase Vertical Surfaces

[SamopleUna Chase Support #6 Vertical Surfaces S E N W.

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2-Meter Line Elev. 29'-10" Wall "F" Wall "G" Top Of Vestibule Elev. 38'-6" P36 P35 P37 P39. P41 P40'

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Attachment 2 Instrumentation July 14, 2008 Survey Unit F8131382

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm2 ) (dpm/100 cm 2 )

M2350; 142514 43-98B; 148639 930 1680 M2350; 180733 43-98B; 148638 930 1680 M2350; 180733 43-94B; 148620 350 610 M2350; 175834 43-68B; 190482 433 1033 M2350; 193700 43-68B; 190294 433 1033 M2350; 142509 43-68B; 160699 433 1033 M2350; 175834 43-68B; 148634 433 1033 M2350; 149789 43-68B; 148633 433 1033 M2350; 149789 43-116-1B; 256006 796 3258 M2350; 175834 43-116-IB; 190642 796 3258 M2350; 180733 43-i11B; 148641 2290 4160 Tennelec; 0401171 N/A 5.9 11.7dpmdpmr(x, N/A 4830 530 Cs-137 Co-60 InSpector 1000 03069793 N/A 5350 Co-60 The scan and static MDC's provided represent the most conservative MDC values for the survey conducted.

Table 2-2. Investigation Criteria and DCGL Value Param eter (dpm/100V l eCcm2 )2 Investigation Criteria - Direct 154800 Investigation Criteria - Scan 154800 DCGLw 43000 DCGLEMC 154800 Page 2 of 2 Att. 2 Instrumentation F8131382

Attachment 3 Investigation July 14, 2008 Survey Unit F8131382 (none required)

Attachment 4 Data Assessment July 14, 2008 Survey Unit F8131382

F8131382 Gross Activity Sample Results Quantile Plot OtM DCGL = 43000 dpm/100cm2 5,000 ,-.

4,500 0401 4,000 S3,500 .

3,000 2,500 1n,000 -

.1500 152 En 0

0 20 40 60 s0 100 Percentile

- 0 Direct Measurements (dprn/IO0cr2) - median - -75th Percentile - - -- 50th Percentile 00

0 F8131382 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpm1100cmn 5000 Es 0

4500 4000

, 3500 1 3134 00 00 0 o00 S1500 000 -- ---

00 0 0* o-- -- -, ,* a *.. 00_- -*o 000000000000 00000000 l1os C'D 1000 -000 500 0

0oo0o0ooaooo0oo0ooooooooooooo wmwmmmt nMeasmumientrLocations 00 MeasurementLocaions 0 Gross Activity - Average - - "+aStDev" - - "-3StDev"I 00 Il

.0 0

F81 31382 Gross Activity Frequency Plot 2

DCGL = 43000 dpm/1 00cm 36 34 32 30 28 26 24 0 22 20 LL 18 16 Ci)

I 14 12 10 8

6 4

O0 2 0

0 C\1 N -

00 00o Bins - Upper End Value (dpmll OOcm2)

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